Real World Java 9
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This document summarizes some of the key features and changes in Java 9, including Jigsaw modularization, the Reactive Streams API, and other enhancements. Jigsaw modularization (Project Jigsaw) overhauls the Java platform module system and tooling like jlink. The Reactive Streams API standardizes asynchronous stream processing. Other changes include improved performance, documentation, graphics handling, and tooling updates. The modular changes may require code restructuring but encourage cleaner design. Adopting features early helps identify issues.
Real World Java 9
- 1. — Trisha Gee (@trisha_gee) Developer & Technical Advocate, JetBrains Real World Java 9
- 2. Real World Java 9
- 3. Real World Java 9 • Jigsaw in Action
- 4. Real World Java 9 • Jigsaw in Action • The Reactive API in Java 9
- 5. Real World Java 9 • Jigsaw in Action • The Reactive API in Java 9 • Everything Else
- 6. Why Java 9?
- 7. Free Lunch! • Better Use of Memory • Better Performance of: • Locking • Secure Apps • Graphics • Better Use of Hardware • Better Documentation • Prettier Graphics (Windows and Linux) • Faster Compilation
- 8. Jigsaw
- 9. REPL
- 12. 274: Enhanced Method Handles 275: Modular Java Application Packaging 276: Dynamic Linking of Language-Defined Object Models 277: Enhanced Deprecation 278: Additional Tests for Humongous Objects in G1 279: Improve Test-Failure Troubleshooting 280: Indify String Concatenation 281: HotSpot C++ Unit-Test Framework 282: jlink: The Java Linker 283: Enable GTK 3 on Linux 284: New HotSpot Build System 285: Spin-Wait Hints 287: SHA-3 Hash Algorithms 288: Disable SHA-1 Certificates 289: Deprecate the Applet API 290: Filter Incoming Serialization Data 292: Implement Selected ECMAScript 6 Features in Nashorn 294: Linux/s390x Port 295: Ahead-of-Time Compilation 297: Unified arm32/arm64 Port 298: Remove Demos and Samples
- 13. The Case Study
- 17. Compiling with Java 9
- 18. Jigsaw
- 19. • JEP 200: The Modular JDK • JEP 201: Modular Source Code • JEP 220: Modular Run-Time Images • JEP 260: Encapsulate Most Internal APIs • JEP 261: Module System • JEP 282: jlink: The Java Linker • JSR 376: Java Platform Module System Project Jigsaw
- 20. Java Platform Module System (JPMS)
- 32. module-info.java
- 33. Pain
- 34. Pain • Some structural reorganisation may be needed
- 35. Pain • Some structural reorganisation may be needed • IDE support is not what we’re used to
- 36. Pain • Some structural reorganisation may be needed • IDE support is not what we’re used to • RTFM. No, really do.
- 37. Gain
- 39. • Cleaner design • Reliable configuration Gain
- 40. • Cleaner design • Reliable configuration • Smaller deployables Gain
- 41. Reactive API
- 43. • Akka Streams • MongoDB Reactive Java Driver • Ratpack • Reactive Rabbit • Reactor • RxJava • Vert.x Implementations
- 44. Java 9 Flow API
- 46. Other Java 9 Features
- 47. 269: Convenience Factory Methods for Collections
- 48. 213: Private Methods on Interfaces
- 49. New Methods on the Streams API
- 50. New Methods on Optional
- 52. 102: Process API Updates
- 53. 238: Multi-Release JAR Files
- 59. JShell (REPL)
- 61. We’d Love Your Help
- 62. We’d Love Your Help https://youtrack.jetbrains.com/issue/ IDEA-161611
- 63. The Pain
- 64. Your code might break!
- 65. Your code might break! Try it out now to find out sooner, not later
- 66. • 214: Remove Deprecated GC Combinations • 231: Remove Launch-Time JRE Version Selection • 240: Remove the JVM TI hprof Agent • 241: Remove the jhat Tool • 260: Encapsulate Most Internal APIs • 289: Deprecate the Applet API • 298: Remove Demos and Samples Going Away
- 67. • 158: Unified JVM Logging • 223: New Version-String Scheme • 245: Validate JVM Command-Line Flag Arguments • 248: Make G1 the Default Garbage Collector • 271: Unified GC Logging Possible Unexpected Behaviour
- 68. Tools are still evolving
- 69. Tools are still evolving …another reason to try it early
- 70. Don’t rush in to modularisation
- 71. Don’t rush in to modularisation It might not be for you
- 72. The Gain
- 74. Encourages new ways of working
- 75. Just a bit nicer to write code
- 76. …and you’ll be ready for Java 10 Or 18.3…